n. A finite sequence of terms.n. A single row in a relational database.n. A set of comma-separated values passed to a program or operating system as a parameter to a function call.n. In some programming languages, a data type which is similar but distinct from the list data type, whose instances are characterized by having a rather fixed arity, and the elements of which instances can differ from each other by data type. (Note: this definition may overlap with the previous one.)